Shock-absorber.



PATENTED MAY 19, 1908.

D. M. DAVIS. SHOCK ABSORBER.

APPLICATION FILED-TUNE 1. 1907.

messes;

chamber 8 with To all whom it may concern:

preferably covered with .wire

exclude dust. from the cy inder Fluid connect the receivin 1 hollowmember, comprising three chambers,

UNITED STATES DAVID M. DAVIS, OF WASHINGTON, DISTRICT .OF COLUMBIA.

SHOCK-ABSORBER.

Be it known that 1, DAVID M. Davis, citizen of the United States,residing at Washmgton, in the District of Columbia, have inventedcertain new and useful Improve-- ments in Shock-Absorbers, of which thefollowing is a specification.

This invention relates to shock-absorbers, and while adapted for use fora variety of purposes, it is particularly designed to be employed withthe supporting" spring of a vehicle to obviate shocks due to the joltingof the vehicle body.

The object of the invention is to provide an improved device for thispurpose which will be efficient in operation and of a simple andinexpensive nature.

Other objects and advantages of the in vention will appear from theannexed detailed description.

One embodiment of the invention comprises the construction andarrangement ofparts hereinafter described, illustrated in theaccompanying drawings, and particularly pointed out in the claims heretoappended.

In the drawings, Figure 1 is a longitudinal vertical section of a deviceembodying the;

features of the invention; Fig. 2 is a cross sectional view on line 22of Fig. 1,-looking in the direction of the arrow, the piston beingremoved. Referring to a detailed description of the drawing, whereinlike reference characters .designate corresponding parts throughout theseveral views, 1 designates a housing comprising a chamber 2 andchambers or-tanks-3 and 4, the housing being preferably formedelliptical in cross-section'as illustrated in the drawing, Fig. 2, toprovide for formation of chambers 3 and 4 with posite structure.

8 designates a piston adapted for recipro cation in the, chamber'2, saidiston being provided with piston rod 14 w ich extends to the'exterior ofthe housing 1 and is pro vided with means for connecting the same. withthe body of a vehicle; the housing 1 being provided with means 18 forconnecting thesan'ie to the running The chamber 2 is provi 3 to theatmosphere, said openings being and -9 passages 7 the chamber 2. at"one; on

Specification of Letters Patent. Application filed June 1, 1907. SerialNo. 376,869.

main cylinder compression the chamber 2 in single comgear of thevehicle. ded with openings sum or mesh Patented May 19, 1908.

thereof andfluid passages 10 and 11 are provided to connect thereceiving chamber 4 with the chamber 2 at the opposite end thereof.Check valves A are provided for the fluid passages 9 and 11, beingarranged .to permit the passage of fluid from the chamber 2 to thereceiving chambers 3 and 4 but to prevent-the return of fluid from saidchambers to chamber 2 through said passages. The passages 7 and 10 areprovided with regulating valves B in order that the amount of fluidpermitted to pass through said passages may be varied.

The-normal position of the piston 8 is between the openings 13 as on adownward movement of the piston past one of the openings 13 the fluid inthe lower part of the compression chamber 2 is compressed and fluidpasses slowly therefrom through the passages 10and 11 to the receivingchamber 4 so that gradual cushion ing of the piston is attained. On thereturn movement of the piston, fluid from the ohamber 4 slowly escapesto the chamber 2 by way of the passage 10 only, the return or" fluid.from said .much slower than its entrance thereinto. The piston on itsupward movement past the openings 13 is'cushioned in a mannersimilarto'that on its downward stroke by means of the receivingchamber 3and the passages 7 and 9. Itis obvious that the device herein set forthis bperative if but one. auxiliary chamber be employed.

What is claimed isi p 1. Ashoclg-absorber comprising a cylinder havingcommunicationwith the atmosphere, a piston in said cylinder, receivers,fluid passages from the cylinder to the receivers, re: turn fluidpassages from the receivers to'the cylinder, non-return check-valves forthe -mentioned v passages, and regulating valves for the returnpassages. I

i 2. .A shock-absorber com rising a cylinder having communication witthe outside atmosphere, a piston insaid c linder, receivers havingcommunication wit the cylinder at opposite ends thereof, thecommunication between each receiver and the cylinder iiicluding a fluid(passage from the cylinder to the receiver an a return passage to thecyl- Qinder, a non-return check valve for the first .passage, and aregulating valve for the return assage.

f 3. Tn a device as set forth, an elongated will be understood,

chamber being therefore a central cylinder-shaped chamber and twoauxiliary chambers being formed by constructing the said memberelliptical, a piston mounted for reciprocatory movement in the centralchamber, said members having air vents, said auxiliary chambers havingcommunication with the central chamber at opposite ends thereof.

4. In a device as set forth, a hollow member elliptical incross-section, comprising three chambers, a central chamber and twoauxiliary chambers, a piston movable in the central chamber, saidcentral chamber having air vents intermediate the ends thereof,

; said auxiliary chambers having communication' with the central chamberat ends thereof.-

5. In a device as set forth, a hollow member elliptical in cross-sectioncomprising three chambers, a central chamber and two auxiliary chambers,a piston movable in the opposite central chamber, said central chamberhav ing air vents intermediate the ends thereof, the auxiliary chambershaving communication with the central chamber in such wise that upon theu ward stroke of the piston, the air is force into one of said auxiliarychambers and upon the downward stroke, air is forced into the otherauxiliary chamber, at the same time air is returned from the first-namedauxiliary chamber in reduced volume upon the-downward stroke of thepiston while air is returned from the second mentioned auxiliary chamberin reduced volume upon the upward stroke of the piston thereof.

In testimony whereof I afiix my signature in presence of two witnesses.

DAVID M. DAVIS. Witnesses:

.E. L. MCCLELLAND.

SAMUEL P. ABBOTT.

